code: def instance_available(self, state_str):
      parse_result = self.state_parser(state_str)
      if parse_result is None:
          return False
      _, used_mem, total_mem, occupation = parse_result
      occupation /= 100
      return (
          used_mem / total_mem < _max_used_mem
          and occupation < _max_used_gpu
      )
  
imports: from subprocess import Popen, PIPE
  from threading import Thread, Lock
  from queue import Queue
  from time import sleep
  from sys import stderr
  import re
  import json
label_desc: Use image node_id 3 for calling the GpuChecker obj's underlying member method code with example usage: obj.instance_available(state_str) and returns: unknown, False